a) 30 kg.
b) 35 kg.
c) 42.5 kg
d) 37.25 kg.
Answer: d
Explanation: Total weight of (36 + 44) Students,
= (36 × 40 + 44 × 35) kg
= 2980 kg
Average weight of the whole class,
= $$ {\frac{{2980}}{{80}}} $$ kg.
Average weight = 37.25 kg.
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